Balancing apparatus



F. MIELKE BALANCING APPARATUS Dec. 23, 1930.

Original Filed May 16, 1927 wrls:

maffia i Patented 23, 1930 FERDINAND MILKE, OF CLEVELAND, OHIO BALANCIN G APPARATUS ApplicationA led May 16, 1927, Serial My invention relates to means and mechanisms for balancing a movable element generally and particularly such elements as movable windows to retain the same in variousy moved positions.

`The general object of my invention is to provide a simple, inexpensive, easily operable, easily installable, and efficient apparatus to balance an element movable in relation to another.element. Other objects will appear,

or become apparent or obvious` or will suggest themselves during the description of the apparatus shown in the accompanying draw- 1n0. l

Euch elements as windows are adapted to be raised and lowered into various positions and have balancing means to facilitate the raising and the lowering thereof and to retain them in various positions.

` The present invention aims to provide an efficientbalancing means which is designed' so that duplication of elements reduces the cost of production, that simplicity reduces the cost of production as well as of operation and repairs, that the apparatus can be assembled yas a unit in itself and therefore easily installed, that all sidewise pulls or tilting effects are eliminated, and that all tension in and on the apparatus is directed in a direction of the movement 'of a moving element.

For the purpose of illustration of my invention, I have 'selected a certain type of balancing means and have shown the same in the accompanying drawing. I am aware however that changes can be made in the structure as well as in the arrangement of the elements shown and described herein within the scope of the appened claims.'

In the accompanying drawing Fig. 1 is a perspective view of a portion of a Window With a balancing means embodying my invention inserted therein.

Fig. 2 is a perspective view, on a larger scale, of the balancing means inserted in the window of Fig. 1.

Y ig. 3 isa longitudinal section taken in a Effk vertical plane indicatedby the lines 3-3 in i' Fig. 2and shows the structure and arrangementof the interior elements more' clearly.

110.191,572. Renewed lMay 28, 1930.

Fig. 4 is a perspective view of the heads of Fig. 2.

Fig. 5 is a perspective view of the cages of Fig. 2.

Similar reference characters refer to similar parts throughout the views.

The window shown in Fig. 1 comprises, principally, the casing A, the window B, and the balancing device C which is shown more clearly in Figs. 2 to 5.

Each of the heads D, duplicates of each other, has the flange 10 with the hole 11 through the same to fasten thedevice onto the frame or casing of the window B, the body portion 12 recessed at each side to form the shoulder 13 and having the slot 14, the recess 15 at each side and inwardly of the first mentioned recess,'and the ears 16 at each side of the slot.

The bars 17, duplicates andinade of commercial fiat bar stock, connect the heads D; .Y

the ends thereofA abutting the correspondin shoulders 13 and the corresponding recesse body portions 12. A- pin or axle 18 extends through both of the bars 17 and through thel ears 16 and traverses the slot-14 and is riveted over at each end and'ontoeach of the heads D to form a rigid and complete frame for the device C; The axles 18 are duplicates and made of commercial bar stock.

Each of the cages E, duplicates of each other, has a pair of duplicate plates 19 spaced from each other. holes through it and each of these two holes is in alignment with the .corresponding hole in the other plate of the same cage. One end of the plate of one of the cages extends into the recess 15 in the head at the lower end of the device and the axle .18 which extends through this lower head also extends through the aligned holes in this end of this cage.

The axle 18a extends through the aligned holes in one end of the'other cage. It is observed that this other cage can float or movey laterally as well as longitudinally within the bars 17. i

A shaft 20 extends .through the aligned holes in the other end of each of the cagesand a grooveds'heave or pulley 21'is jour-l naled on eachof the shafts `and' is confined b e- Each plate having two end thereof is hooked onto the axle 18a of the cage which oats between the bars 17.

The-rope 23 is wound over thel sheaves or pulleys 21 in the manner of movable pulleys. The lower end of the rope extends through the hole 24 in the head at the lower end of the device and has a knot to fix this end of the rope to the device. The upper end of the rope extends through the hole 24 in the head at the upper end of the device and has the plate 25 vsecured thereto which plate has holes through it for screws wherewith the same is or can be fastened to the stationary frame of the window. A

In the arrangement shown and described, all portions of the rope are substantially parallel with each other so that all side pull is eliminated and all members can act freely. The balancing device shown and described is intended to be inserted into the frame of a movable window.

In operation When the window B is lowered from the position shown in the drawing, the device C moves with it and, in doing so, that end of thev rope which extends out of the top of the device must lengthen. Such lengthening can only be effected by using the doubled up portions of the rope which is wound around the sheaves in the manner of movable pulleys. Since the lower sheave is fixed on the frame of the device and the upper sheave can move longitudinally in the device, this upper sheave moves toward the lower sheave and, in doing so, creates a tension in the spring 22 which counterbalances the window and thereby permits the same^to be raised or lowered easily and to remain in any position without further locking or any other means.

The apparatus shown and .described attains the object of my invention in one manner of structure and arrangement 0f elements. I' am aware however that changes can be made in the structure as well as in the arrangement of the elements as shown and described; therefore, without limiting myselfto the precise structure and arrangement of elements shown and described,

l claim 1. A balancing apparatus including a frame composed of a plurality of parts two 0f which are heads located on the ends of the lframe and cages and sheaves and rope means and a spring therefor within the frame, each of said heads having a pair of inwardly extending ears to form a slotrtherein, an axle extending through one end of said frame and through said ears in said head thereon and through a portion of one of said cages extending into said slots in said head on said one end of the frame andiholding all of the frame parts together at this one end, and an axle extending through the other end of sald frame and through said ears in said head` thereon and holding all of the frame parts together at this other end and serving as an anchor for one end of said spring.

2. A balancing apparatus including a pair of duplicate bars of commercial fiat stock sidewise of each other, a head on each end of said pair of bars, both heads being dupli cates, an axle through each of said heads and through the corresponding end of said pair of bars, each axle serving as a fastening means for said corresponding heads and'ends as Well as for a suspension means for hereinafter mentioned elements, a pair of duplicate cages each comprising a pair of duplicate plates sidewise of each other, duplicate axles and shafts connecting said plates as well as serving other purposes hereinafter mentioned, one of said cages hingedly suspended on said axle throughd one of said heads, the other one of said cages movable longitudinally between said bars, a spring having one end thereof hooked onto said axle of said other cage and the other end thereof hooked onto said axle through the other one of said heads, duplicate sheaves journaled on the corresponding axles through said cages, and a rope means over said sheaves.

In testimony of the foregoing I affix my signature.

FERDINAND MIELKE. 

